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Home > History and Archaeology > History > Steam Engine Indicators and Valve Gears; A Practical Presentation of Modern Testing Appliances and Methods Used to Produce Maximum Efficiency as Appli
Steam Engine Indicators and Valve Gears; A Practical Presentation of Modern Testing Appliances and Methods Used to Produce Maximum Efficiency as Appli

Steam Engine Indicators and Valve Gears; A Practical Presentation of Modern Testing Appliances and Methods Used to Produce Maximum Efficiency as Appli


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ...of the eccentric rod is very much less than the angularity of the connecting rod, and its influence may be neglected without appreciable error. When the valve shown in Fig. 3 is in mid-position, the crank is on dead center, the eccentric is set at right angles to it, and the piston is just ready to begin the stroke. Fig. 4 shows the relative positions of the crank A, piston B, eccentric E, and valve V, when the crank has made a quarter turn or the piston has moved to about half-stroke. The eccentric is now in its extreme position to the right, the valve has its maximum dis placement, and both the steam and exhaust ports are wide open. The valve will not close again until the piston has reached the end of its stroke. This type of valve is used only on small engines and, since it allows no expansion of the steam, is very uneconomical. Furthermore, it will be seen that this valve opens just after the stroke begins, which is impractical, for it means that the piston has begun its stroke before the full steam pressure reaches it, which will cause an inclined admission line on the indicator diagram. Valve with Lap. If the face of the valve is made longer than shown in Fig. 1, so that in mid-position it overlaps the steam ports, we shall have a valve such as shown in Fig. 5. The amount that the valve overlaps the steam ports when in mid-position is called the lap of the valve. In Fig. 5, DI is the inside lap and 0 C is the outside lap. It will at once be seen that both the admission and exhaust ports may remain closed during a part of the stroke, thus making expan Fig. 6. Valve with Inside and Outside Lap Set for Admission sion and compression possible. It is also evident that steam can not be admitted until the valve uncovers the port by moving from mid-position ...


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Product Details
  • ISBN-13: 9781236029362
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 50
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1236029364
  • Publisher Date: 16 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 109 gr

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Steam Engine Indicators and Valve Gears; A Practical Presentation of Modern Testing Appliances and Methods Used to Produce Maximum Efficiency as Appli
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